U7E

1973 Yamaha U7E Technical Analysis & Specification Breakdown

At the heart of the 1973 Yamaha U7E scooter motorcycle, Yamaha relies on a 72 cc (4.4 cu in) single cylinder, two-stroke powerplant. In factory specification, peak output is rated at 4.9 HP (3.6 kW) at 6,500 rpm while maximum torque reaches 6.4 Nm (4.7 lb-ft) at 4,500 rpm, transferring power to the rear wheel through chain final drive. With a specific output of 68.1 HP per liter and a 2,000 rpm working window between peak torque (4,500 rpm) and peak power (6,500 rpm), the engine character is indicating a tractable, stress-free state of tune focused on everyday usability and broad torque delivery.

On the scales, the U7E measures 77 kg (170 lbs) dry. Rider ergonomics and chassis geometry center around a 1,175 mm (46.3 in) wheelbase engineered for quick, flickable steering geometry. The 4.5-liter (1.2 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 85 km/h (53 mph).

Within MotoLibrary's Yamaha archive, this model family spans 2 indexed model years from 1972 to 1973, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.